Rotary jar



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. J. A. KAMMERDINER ROTARY JAR Filed Oct. 30 .-1922 2 Sheets-Sheet 1 BY 7MB@ mf man ATTORNEYS @et 2 1923. Lg

J. A. KAMMERDINER ROTARY JAR Filed Oct. 50, 1922 2 Sheets-Sheet 2 INVENTOR I f/Zme A. [famme/@Mer BY WMM ATTORNEYS nerr aan.

Application led (Matcher 30, 1922. 4Serial 1to.'97,726.

7 Toall whom t may' concern.

I"it vknown that I, JAMES ALLENKAM- mRDINnR, a citizen of the United States, and resident of Montebello, in the county of Los Angeles, State of California, have invented new and useful Improvements in a Rotary Jar, of which the following is a' specification.v y

This -inventionrelates to a jar adapted for use in thehydraulic rotar drilling of wells,v as commonly practice in drilling wells for oil. The Ljars are used to assist in loosening tools which become stuck in the hole, andare especially useful when fishing for'lost tools. In hydraulic rotary drilling, itis essetial that a circulation of water or water and mud be maintained in the hole. This circulati'on'f.-4 isto prevent the settling of drillingsU-i'n the bottom of the pipe or tools fast in itheghole. `Circulation must be keptup," even though', drilling ceases .In spiteof these 'precautions the ipe'and tools will at timesbecome'stuclc 1n' the` hole. At vsuch times, it is advantageous to have jars which may be employed 'to jar the pipe .ortool loose.`r Such jars 'must be construc'tedf-sdthat4 they will not interfere' with circulation.

is to provide a jar 'adapted to be placed in a strin of drill pipe, which will not interfere with' circulation at any time and' will permit the rotation'of thestring. In addition to the broader objects of this invenwhereby a strong, simple, economical,y and easily manipulated jar is obtained.

These objects together with other objects and. corresponding accomplishments are obtained by means of the embodiment of my invention illustrated in the accompanying drawing, in which: Y

Fig. 1 is a perspective view of the com` plete jar with sections thereof broken away to better show thestructure; Fig. 2 is an axial section throu h the jar' Fig. 3 -is a perspective view o? the T; igs. 4 and ,5 are perspective views of the subs.

Referring more particularly to 'the drawings, the upper sub has a male tool joint `portion 6 on a body 7 and a head 8.- Extending through the sub is a bore 9 to slidably receive a conduit. The upper end of the bore is enlarged and threaded to re-l ceive a packing gland 10. The lower portio tra

hole, as' such settlings; iiiay' 'freeze the drill,

The Aprimary4 object of Vthis invention tion, there are certain details of structure,

, or Monumento, oanironmn.

tion of the head is reduced in diameter and threaded as indicated by 11. Extending" transversely across the lower portion of thev head is a pocket 12 to receive the head of the T so as to form a clutch therewith for the sub is a rotary sub.

a The lower sub 14 is of the same external diameter as the head of the rotary sub, is.' reduced in diameter and threaded as indi-` purpose of rotating the string of pipe. This cated by 15. The lower sub has a bore 16 to s lidably receive the leg of the "i". Y The bore is enlarged 'and threaded to receive a packing gland 17. The upper portion of the lower sub is provided with a pocket 18 to receive the head of the T, and the upper faces of the sub are inclined downwardlyv in the saine direction toward the bottom of the pocket. This sub is an impact sub,J The stock of the impact sub is extended toA form posts 19 to limit turning of the T.

Connecting the subs is a bowl 20.; This 'l bowl provides a chamber in which the T may be moved. `The T comprises a't'ubular leg 21 having a tool joint at its lower end and a head 22 such that it may be disposedv l in either pocket 12 or pocket 18. The upper face of the T head is Hat so that'it may be disposed 'to snugly rest in the pocket i12, f'i" and the lower faces are inclined to conform to the inclination of the faces on the impact sub. Extending from the head and threadedly secured thereto is a tubular crown member 23 which slidably passes through the upper sub.' It is obvious that the T is so arranged that it may be moved from the pocket 18 in the impact sub to f the vpocket 12 in the rotaryasub. In either'- position there is a complete closed passage way extending from the tool joint in the vupper plug to the tool joint in the lowery I sub. The packing glands in the'subs permit the chamber in the bowl to be filled with grease t0 allow easy operation and to' prevent leakage of the grease from the bowl llo@ or entrance of mud and sand into the bowl.

When it is desired to rotate the strin of pipe, the string-is lowered until the hea 22 Vfl"'placed upon the string'by pulling it upward- The vbowl'is thenturned until the T head registers vwith the pocket 18, whereupon the T will snap into the pocket thereby jarring the string and'loosening the tool. rllhe in- A'clined faces of the T -on the impact sub assist the head in sliding into position in the pocket. The posts 19 on the lower sub pre' vent the T from turning too far when resting on the faces of the impact sub.

What ll claim is: l

1. A rotary jar. adapted to be connected in a string of pipe comprising a bowl section having a chamber provided with a pocket at one ends a tubularT slidably'extending into v4'said chamber and having a head arranged to fit within said pocket and means to conneet the bore of said T with said bowl so as to provide 'a closed expansible passage.

,through said jar, the headof said T being arranged to be disposed out'of said pocket and to rest upon the end across said pocket or to be disposed in said pocket at will.

2. A rotary jar adapted to be connected in a string of pipe comprising a bowl section having a chamber, said bowl section having a bottom wall provided with a transverse pocket, a tubular Tslidably extending into said chamber having a head arranged to fit within said pocket, and means to connect the bore of said T with said bowl so as to provide a closed expansible passage through said jar, the head of said T being arranged to be disposed out of said pocket or in said pocket at will.

3. A rotary jar adapted to be connected in a string of pipe comprising a bowl section having a chamber provided with a pocket in its upper wall and a corresponding pocket in its lower wall, a tubular T slidably extending into said chamber having a head arranged to fit within said pocket, and means to connect the bore of said T to said bowl so as to provide a closed expansible passage through said jar, the head of said T being Laeaaoe arranged to be vdisposed out of said pocketA of said pockets, and means to connect the bore of said T with said bowl so as to provide a closed expansible passage through said jar.

5. rotary jar adapted to be connected in a string of pipe comprising a rotary sub having a transverse pocket, an impact sub having a transverse pocket, a cylindrical bowl connecting said subs and forming a chamber, a tubular T slidably extending into said chamber and having a head arranged to t within either of said pockets, a tubular extension mounted on said T and slidably extending through said rotary head so as to provide a closed expansible passage through said jar.

6. A rotary jar adapted to be connected in a string of pipe comprising an impact sub having :a transverse pocket, the faces of said impact head being inclined at the pocket, a rotary sub having a transverse pocket, a cylindrical bowl connecting said subs and forming a chamber, a tubular T slidably extending into said chamber and having a head arranged to it within either of said pockets, and means to connect the bore of said T through the rotary head so as to provide a closed expansible passage through said jar.

7. A rotary jar adapted to be 'connected in a-string of ypipe comprising an impact sub having a transverse pocket, the faces of said impact head being inclined at the pocket, a rotary sub having a transverse pocket, a cylindrical bowl connecting said subs and forming a chamber, a tubular T.

slidably extending into said chamber and having ahead arranged to t within either of said pockets, a tubular extension mounted on said T and slidably extending through said rotary head so as to provide a closed expansiblerpassage through said jar.

In .witness that ll claim the foregoing lt have hereunto subscribed my name this 20th day of ctober, 1922.

JAMES ALLEN KRDTNER. 

